A threesome involving two men and one woman. There are several options for who actually has sex with whom:
(1) the woman in the middle;
(2) one of the men in the middle;
(3) everyone has sex with both the others.

Thanks to Lara, I managed to get Toby into bed on Saturday; he went for an MMF.

MMF is when 2 males and one female have sex in 1 bed at the same time.

Jack: hey Zac,
Zac: ya?
Jack: wanna come over to my house and have sex?
Zac: with you? your damn gay!
Jack: ....
jack: i mean with my girlfriend too...
Zac: you mean that hot chick that gave you that blowjob?
Jack: ya...
zac: k, ill go
Jack: will you give me a handjob too?
Zac: i knew you were gay! you just wanted to hump me!
Zac: FUCK OFF, BITCH!
Zac: YOU JUST WANT TO DO MMF!